Heat-insulating tape



Sept. 13, 1927; I 1,642,204

c. L.. HILL HEAT INSULATING TAPE Filed Sept. 1l. 1926 Patented Sept. 13,1927.

UNITED STATES PATENToFFlcE.

CHESTER L. HILL, OF CHICAGO, ILLINOIS, ASSIGNOR TO UNION ASBESTOS &RUBBER COMPANY, OF CHICAGO', ILLINOIS, A CORPORATION OF ILLINOIS.

HEAT-INSULATING TAPE.

Application filed September 11, 1926. Serial No. 134,772.

My -invention relates to tape which is formed of heat insulatingmaterial and which is adapted to be applied to fluid con- Iducting pipesof various kinds. The most satisfactory tape of this kind comprises aflattened tube or sheath, formed of a textile fabric of asbestos,containing a suitable heat insulating filler of, asbestos fibers.However, devices of this kind, as heretofore constructed and used., havebeen subjected to-the objection that, when spiralled around a pipe, thelateral edges thereof, and particularly the edge which is subjected vtothe greater tensile stress in the spiralling operation, have becomeobjectionably thin or knife edged. This tendency of the tape edges tobecome thin or knife edged when tightly spiralled around a pipe,detracts from-the appearance of the pipe covering and also ldiminishesthe heat insulating quality of the coverin at contiguous portions of thetape convo utions.

It is the purpose of the present invention to provide a heat insulatingtape,'compris ing a sheath of heat insulating textile fabric and asuitable insulatingv filler, which will not be drawn thin at its edgeswhen the tape is tightly spiralled around a pipe or the like,-thisresult being accomplished withput incorporating anything but -good heatinsulating materials in the tape.

In the accompanying drawing'illustrating my invention:

' Fig. l illustrates the manner of applying m'improved tape to a pipe,

ig. 2 is a transverse sectional view of the tape, and

Fig. 3 is a View similar to Fig. 2, but illustrating a modifiedconstruction contemplat- 40 ed by the present invention.

In the drawing reference letter A generally indlcates the insulatingtape of my invention, B indicates a pipe to which the tape-isapplied,and C indicates devices for securing the tape upon the ipe.

The tape A consists of a attened tube or sheath 1 which is formed of aheat insulating and heat resisting textile fabric, the woof and warp ofwhich are preferably cords `or strands of asbestos fibers. This sheathis preferably woven, in tubular form, but I contemplate that the tube orsheath so located with respect to the sheath anpd to scribed in GilliesPatent No. 1,47 0,7 23, dated October 16, 1923) which in recent yearshas met with almost universal approval. I do not, hoWe ver, limit myselfto the use of this particular type of filler.

v I shall now describe those features of the tape withA which my presentinvention is `more particularly concerned:

Carried with the flattened tube or sheath 1 l.and co-extensive therewithare internal longitudinal fins 3-3 which are formed of the same materialas the sheath and are in fact integral parts thereof. These fins areeach other that in the completed tube hey lie directly opposite to eachother, occupying the lateral. portions of the sheath and effectuallypreventing the tube from becoming thinned out at its edges regardless ofhow tightly it may be spiralled around a pipe.

The inwardly projecting longitudinal fins `may be woven upon and in onepiece with the sheath, at the same time that the sheath itself is Woven,or the said ns may be formed u on and interconnected with the sheath ater the latter has been woven.

l However, I find it most economical and most practical to Weave thefins simultaneously with the weaving of the sheath. l

In Fig. 3 I have illustrated a modification which, while not sodesirable as the construction-4 shown in Fig. 2, nevertheless fallswithin the purview of the present invention. In this modification thetape sheath, whlch is preferably, but not necessarily, formed on acircular loom, is flattened and 1s provided with longitudinal stitching4--4, eachline of stitching passing through both plies of the sheath andbeing spaced somewhat from one of the lateral margins of the sheath. Thesheath is then turned inside out and the filler inserted, thestitched-together portions of the sheath constituting the internallongitudinal fins contemplated by the present invention.

1n applying the tape to a pipe, that end of the tape which is firstapplied is preferably cut on the bias a distance equal to ap;`proximately three times the diameter ofthe pipe. One wra is then madearound the pipe with the o lique end thereof lying in a transverse planeof the pipe. The said end of the tape is then secured by any suitablemeans, such as a hose clamp or band of the kind shown at C. rlhe tape isthen tightly and closely spiralled around the pipe the distancerequired, additional clamps being utilized at intervals as shown.

While l prefer to provide the tape sheath with an inwardly projectinglongitudinal fin at each of its lateral margins, l contemplate that butone such fin may be utilized if desired,-i. e., Iat the edge of t-hetape which is subjected to the greater tensile stress during thespiralling operation.

Having thus illustrated and described my invention, what l claim as newand desire to secure by Letters Patent is:

1. A heat insulating tape adapted to be tightly spiralled around a pipecomprising a flexible sheath consisting of a flattened tube of heatinsulating textile fabric having flat exterior edges, a pliable heatinsulating filler within said sheath, said sheath having an inwardlyprojecting portion located at the edge of said flattened tube to providea wall substantially thicker at said edge.

2. A heat insulating tape adapted to be tightly spiralled around a pipecomprising a flexible sheath consisting of a flattened tube of heatinsulating textile fabric having fiat exterior edges, a pliable heatinsulating filler within said sheath, said sheath having an inwardlyprojecting portion located at the edge of said flattened tube ofsubstantially the same thickness as said filler when spiralled upon`saidpipe.

3. A heat insulating tape adapted to be tightly spiralled around a pipecomprising a flexible sheath consisting of a flattened tube of heatinsulating textile fabric, a pli able heat insulating filler within saidsheath, said sheath being of substantially rectangular cross sectionwith rounded corners and having its edge walls substantially thickerthan its side walls.

4. ln a heat insulating tape of the class described, the combination ofa sheath consisting of a flattened tube of heat insulating textilefabric having flat exterior edges, a heat insulating filler within saidsheath, and inwardly projecting portions interwoven at each edge of saidliattened tube with the material of the sheath, said portions being ofsubstantially the same thickness as said filler when spiralled upon saidpipe.

5. In a heat insulating tape, a sheath comprising a seamless flattenedtube of' heat insulating textile fabric, a filler within said sheathcomprising a plurality of ropes of' heat insulating material, theexterior edges of said tube being adapted to fit closely together andbeing reinforced by an inwardly projecting longitudinal fin of heatinsulating fabric interwoven with said sheath.

6. A heat insulating tape adapted to be tightly spiralled around a pipewithout overlapping the edges of said tape, comprising a pliable heatinsulating filler, and a exible sheath for said filler, consisting of alayer of heat insulating fabric extending about said filler to form atape, said fabric having inward folds at each edge of said tape, to takethe place of said filler at said edges.

7. A heat insulating tape adapted to be tightly spiralled around a pipewithout overlapping the edges of said tape, comprising a pliable heatinsulating filler, and a flexible sheath for said filler, consisting ofa layer ot' heat insulating fabric extending about said filler to form atape, said fabric having inward folds at each edge of said tape, to takethe lace of said filler at said edges and said fol s being securedtogether by stitchinfr.

A heat insulating tape adapted to be tightly spiralled around a pipewithout overlapping the edges of said tape, comprising a continuoussheath of heat insulating fabric, said sheath having an inwardlyprojecting portion interwoven with the same at one edge thereof, and afiller of heat insulating material in said sheath.

9. A. heat insulating tape adapted to be tightly spiralled around a pipewithout overlapping the edges of said tape, comprising a continuoussheath of heat insulating fabric, said sheath having an inwardlyprojecting portion interwoven with the same at one edge thereof, and afiller of heat insulating material in said sheath, said fillercomprising a plurality of loose ropes of asbestos ber.

10. A heat insulating tape comprising a seamless fabric sheath ofinterwoven heat insulating and heat resistive fibers and a heatinsulating and heat resistive filler for said sheath comprising aplurality of loose ropes of heat insulating and heat resistive libre,said sheath having a reinforcing fold projecting inward at one edge.

l1. The method of constructing a heat insulating tape, comprisingforming a sheath of heat insulating and heat resistive fabric forming anoutwardly projecting lin on the edge of said sheath, turning said sheath'inside out and filling the same with a filler of heat insulating andheat resistive fibers.

12. The method of constructing a heat insulating tape comprising weavinga seamless sheath of asbestos strands, with an integral rib along oneedge, turning said sheath inside out and filling the same with looseropes of asbestos liber.

.18. An article of manufacture comprising a heat insulating tapeconsisting of a filler of loose asbestos bers, and a sheath of wovenasbestos fabric, said sheath having inward folds at each edge of thesame and a line of stitching along each edge, said in- Ward folds takingthe place of some of said filler along said edges and reinforcing said ledges against thinning.

In Witness whereof, I hereunto subscribe my name this 7th day ofSeptember, 1926'. CHESTER L. HILL.

